Securing armature coils



Dec. 8, 1925.

G. B. SAYRE SECURING ARMATURE COILS Filed NOV; 29. 1924 wwmwoz Patentedi combo): is. snxnig, .or azaleas-n: new Yonir.

SECURING KRMATUBE COILS.

' Application filed November 29, 1924. seenno. 752,898.

To all whom it may concern Be it known that I, GonnoN B. Saran, acitizen of the United States, and-a resident of Syracuse, OnondagaCounty, New York,

have invented an Improvement inSecuring Armature Coils, of which thefollowing is a specification.

My vention relates to a method 01' and means for securing coils inarmatures or the are provided within. series of recesses near' thecircumferential surface, which recesses practice to line the. recessesand teeth with a insulating fibres.

7 of the sma like. Man of these armatures, particularly ller sizes, aremade with what. are

called peripheral teeth, that is to say they have narrow throats, and inwhich are placed the armature coils. It is a common thin insulator,usually paper, and this as a matter of convenience is generally madecontinuous so as to extend around the surface of the recesses and overthe teeth, and it is easier to do this than to use a separate stripforeach individual recess. After the coils method and means of securingthe coils, and

also to provide means for securin them so that they are not likely tobecome oose.

In carrying out this idea, I provide a strip of material which isspringy and insulating, and whichis usuall one of the well known throatsof the several recesses, and as it passes each throat, I punch from thestrip a section of the material which is forced inward through thethroat and against the resistance of the coil, and as the punch is ofthe same width as the throat, it shears the pa or from the throat,pushes the severed strip in'through the throat by reason of bending itlengthwise, and the coil will yield sufiiciently to permit the severedstrip to be inserted through the throat and to the outer is is fedopposite the great} improvei.

' Figure- 2 is a detail diagrammatic view showing the manner in which afastenin strip is cut from the main piece, bent, pushed through thethroat, and secured against the outer part of the coil, and j Figure 3is a. broken enlarged detail perspective view showing the structure"more clearly. Y ...The armature 10 may 'beof any approved kind, and inFigure 1 I have shown it merely in outline, but it is of the typewhich'has peripheral recesses'll extending across the face, and in whichthe coils 12 are placed. The. recesses have throats'13 o nin' outwardthrough the peripheral wa lof t e armature, and the shape of therecesses is conventional leaving abrupt shoulders at the inner enofthe'throats 13, but the contour of the recesses themselves is ofcourse immaterial.

Before the coils ie formed in the rccesses, these are usually lined withsheetinsulation- 14,, which is generally paper, and as a matter ofeconomy in time and convenience of arrangement, the strip is usuallyextended around the wall of, each recess, then over the adjacent top tothe next recess, and so on around the armature; After the coil isfastened in place, it is desirable to remove the paper from the throat13 and from the outer face of the armature By my improvements I amenabled to ferred manner, but my method of fastening is as follows. Astrip of sheet material 15,

preferably insulating fibre of desired stifi'- ness, is fed across theseveral throats 13 one by one, as shown in Figure 1. The punch 16 isshaped to exactly fit each throat 13, but has its middle portion convexas shown. at

17, leaving a shoulder 18 at each side of the convex part. Consequentlyby referring to Figure 2 it will be seen that when the part 17 strikesthe sheet 15, it will first bend a section as shown at 15, and as thepunch advances further it will sever a strip from the indicatecorresponding parts in all the views. 1

Figure 1' 1s 'a diagrammatic elevation of apart of an armature showingmy invention.

have the paper 14 and the coils. 12 placed in the several recesses inthe usual or any presheet as shown Figure 2, and ultimateedges of thestrip will spring beneath the shoulders of the throat 13, and as thepunch is removed, the tension of the coil 12 will hold the stri 15securely in place and. in a manner to e ectually 'seal the throat 13.

Moreover it will be observed that when the A shoulders 18 pass throughthe throat 13 they gage 'one of the throats 13 whilethe punch,

16 18 operating in another, and the means Ifori' will shear 011' theinsulating paper 14 atthe entrance to each side of the throat 13, and,the inner parts of the paper will fold beneath the strip 15 as shown at1 1 in Fi re 3, and these'loose ends will be firmly eld between the coiland the strip 15.

I have not shown the means for stepping forward the sheet 15,- orfor'operating the punch 16, as the sheet feed and punch operatingmechanisms are so thoroughly known in .the art, and'moreover any of theusual feeding and punching devices can be used.

'In carrying out the invention, however, it is desirable to use a detent19 which will endoing this it is not necessary to showlbecause it is themost ordinary shop practice. i 'It is] essential to have the face of thepunch ltishaped substantially as indicated, however,

art which will, bend the fastening strip 15 efore the shoul-Z. ders ofthe punch begin to shear the strip and shear the paper 14. So. far asthe op? eration of the punch is concerned, 'it will be seen that thewalls of each throat 13 serve as one member of a die, the punch forming.the other member, and it will be furthervunderstood that there is a verysubstantial re--, sistance by the coil 12 to the final movement of thepunch 16, so that the reaction of thethat is to have a convex coil issuflicient to bind the 'strip l5 firmly the strip being forced out,while at the same time it secures the coilagainst displacement. Iclaim 1. The combination'an armature havmg recesses with peripheralthroats nar rower than the recesses-of coils in said recesses, andinsulating strips extending the full length of the throats andoverlapping the inner walls thereof so as to lie between thecoils andthe outerrecess walls thereby sealing the throats for their full length.

2. The improvement in the art of securing armature coils in armaturerecesses having and permitting them to expand after passing through thethroat thereby overlapping the I inner edges of the throat.

3. The improvement in the artof securin Y armature coils inrecesses'having peripherall throats, which consists in forcing a stripof springy fibrous material wider than the t roat through the'throat bybending the material lengthwise," forcing-the bent strip against thetension of the coil in the recess,

- and then permitting the expansion and straightening of the strip whichcauses it to be bound between the coiland the outer 'wall of the recessthereby covering and sealing the, throat.

4. The improvement in the art of securin armature coils in recesseshaving periphera throats, which consists in punching from an insulatingsheet successive strips of material wider than the adjacent armaturethethroat and at the same time causin punch to force the severed strithrong the adjacent/throat and against t e tension of I-the containedcoil in the adjacent recess,

which act bends the strip lengthwise,'then close the inner end *leng't wis'e i nid' ;shear I the sheet insulator -from th'e'g thrbat walls"whereby the expansionandstraightening/of the bent strip causesit toseal the inner 'end of the throat onthe withdrawalio'f -the punch and tobe positionedby the pressure of the coil between the coils and thead'acent walls'of]. the recess-11, and thus there is no danger of 1against it. v v

6. The improvement in the art of securing coils in armatures havingrecesses ,with'pe iripheral throats and with the throats and flecesseslined with insulating paper, which consists in simultaneously bendinglengthwise and forcing through the throat a fastening strip, shearingthe paper irom the throat, and then withdrawing the pressure from thestrip thereby permitting itto expand and- 'seal-theinner end of thethroat.

In. testimony whereof, I have signed my name to this specification this26th:,day of November, 1924.

GORDON SAYRE.

I so {withdrawing the punch and permitting the I stri to expand so as toof e throat.

5 The im rovement in the art of securing

